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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.openecomp.core.converter.pnfd.parser;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import org.apache.commons.collections.MapUtils;
import org.onap.sdc.tosca.datatypes.model.ServiceTemplate;
import org.openecomp.core.converter.ServiceTemplateReaderService;
import org.openecomp.core.converter.pnfd.model.ConversionDefinition;
import org.openecomp.core.converter.pnfd.model.PnfTransformationToken;
import org.openecomp.core.converter.pnfd.model.Transformation;
public abstract class AbstractPnfdBlockParser implements PnfdBlockParser {
protected final Transformation transformation;
protected ServiceTemplateReaderService templateFrom;
protected ServiceTemplate templateTo;
public AbstractPnfdBlockParser(final Transformation transformation) {
this.transformation = transformation;
}
/**
* Parses a PNFD block based on the {@link Transformation} provided during the {@link PnfdBlockParser}
* instantiation.
*
* @param templateFrom the original PNFD template
* @param templateTo the resulting PNFD template
*/
public void parse(final ServiceTemplateReaderService templateFrom, final ServiceTemplate templateTo) {
this.templateFrom = templateFrom;
this.templateTo = templateTo;
final Set<Map<String, Object>> blockToParseSet = findBlocksToParse();
if (!blockToParseSet.isEmpty()) {
blockToParseSet.forEach(this::parse);
}
}
/**
* Applies all specified conversions in {@link Transformation#getConversionDefinitionList()} for the given
* blockYamlObject.
*
* @param blockYamlObject the block content as a YAML object
*/
protected void parse(final Map<String, Object> blockYamlObject) {
if (MapUtils.isEmpty(blockYamlObject)) {
return;
}
final List<ConversionDefinition> conversionDefinitionList = transformation.getConversionDefinitionList();
final Map<String, Object> parsedBlockYamlObject = new HashMap<>();
final String blockName = blockYamlObject.keySet().iterator().next();
conversionDefinitionList.stream()
.filter(conversionDefinition -> conversionDefinition.getConversionQuery().isValidAttributeQuery())
.forEach(conversionDefinition -> {
final Map<String, Object> query =
(Map<String, Object>) conversionDefinition.getConversionQuery().getQuery();
final Map<String, Object> blockAttributeMap = (Map<String, Object>) blockYamlObject.get(blockName);
final Optional<Map<String, Object>> parsedBlockAttributeMap = buildParsedBlock(query, blockAttributeMap
, conversionDefinition);
parsedBlockAttributeMap.ifPresent(convertedNodeTemplateAttributeMap1 ->
mergeYamlObjects(parsedBlockYamlObject, convertedNodeTemplateAttributeMap1)
);
});
write(blockName, parsedBlockYamlObject);
}
/**
* Writes the block in the resulting {@link ServiceTemplate} {@link #templateTo}.
*
* @param blockName the name of the block
* @param parsedBlockYamlObject the block content as a YAML object
*/
protected abstract void write(final String blockName, final Map<String, Object> parsedBlockYamlObject);
/**
* Uses the provided attribute query to find a attribute in the original YAML object and apply the provided
* conversion.
*
* @param attributeQuery the attribute query
* @param fromNodeTemplateAttributeMap the original YAML object
* @param conversionDefinition the conversion
* @return the rebuilt original YAML object with the converted attribute
*/
protected abstract Optional<Map<String, Object>> buildParsedBlock(final Map<String, Object> attributeQuery,
final Map<String, Object> fromNodeTemplateAttributeMap,
final ConversionDefinition conversionDefinition);
/**
* Merges two YAML objects.
*
* @param originalMap original YAML object
* @param toBeMergedMap YAML object to be merged
* @return the new YAML object representing the merge result.
*/
protected Map<String, Object> mergeYamlObjects(final Map<String, Object> originalMap,
final Map<String, Object> toBeMergedMap) {
toBeMergedMap.forEach(
(key, value) -> originalMap.merge(key, value,
(toBeMergedValue, originalValue) -> {
if (originalValue instanceof Map) {
return mergeYamlObjects((Map) originalValue, (Map) toBeMergedValue);
}
return originalValue;
})
);
return originalMap;
}
/**
* Executes the provided {@link #transformation getConversionQuery} YAML query to find the blocks to be parsed in
* {@link #templateFrom}.
*
* @return The YAML blocks found
*/
protected abstract Set<Map<String, Object>> findBlocksToParse();
/**
* Checks if the YAML object is a TOSCA get_input call
*
* @param yamlObject the YAML object
* @return {@code true} if the YAML object is a TOSCA get_input call, {@code false} otherwise
*/
protected boolean isGetInputFunction(final Object yamlObject) {
if (yamlObject instanceof Map) {
final Map<String, Object> yamlMap = (Map<String, Object>) yamlObject;
return yamlMap.containsKey(PnfTransformationToken.GET_INPUT.getName());
}
return false;
}
/**
* Gets the value (input name) of a YAML object representing a TOSCA get_input call: "get_input: <i>value</i>".
*
* @param yamlObject the YAML object
* @return The get_input function value, that represents the input name
*/
protected String extractGetInputFunctionValue(final Object yamlObject) {
if (yamlObject instanceof Map) {
final Map<String, Object> yamlMap = (Map<String, Object>) yamlObject;
return (String) yamlMap.values().stream().findFirst().orElse(null);
}
return null;
}
/**
* Gets the stored input names called with TOSCA get_input function and its transformation configured in {@link
* ConversionDefinition#getToGetInput()}
*/
public Optional<Map<String, String>> getInputAndTransformationNameMap() {
return Optional.empty();
}
}
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